/**************************************************************************** * configs/ea3131/src/lpc31_mem.c * * Copyright (C) 2009-2010,2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * References: * - NXP UM10314 LPC3130/31 User manual Rev. 1.01 — 9 September 2009 * - NXP lpc313x.cdl.drivers.zip example driver code * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "chip.h" #include "up_arch.h" #include "lpc31_syscreg.h" #include "lpc31_cgudrvr.h" #include "lpc31_mpmc.h" #include "ea3131.h" #ifdef CONFIG_LPC31_EXTDRAM /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* The MPMC delay based on trace lengths between SDRAM and the chip and on * the delay strategy used for SDRAM. */ #define EA3131_MPMC_DELAY 0x824 /*Delay constants in nanosecondss for MT48LC32M16LF SDRAM on board */ #define EA3131_SDRAM_TRP (20) #define EA3131_SDRAM_TRFC (66) #define EA3131_SDRAM_TRAS (44) #define EA3131_SDRAM_TREX (75) #define EA3131_SDRAM_TARP 4 #define EA3131_SDRAM_TWR (75) #define EA3131_SDRAM_TRC (66) #define EA3131_SDRAM_TRRD (15) #define EA3131_SDRAM_TMRD (20) #define EA3131_SDRAM_TXSR (75) #define EA3131_SDRAM_TDAL (50) #define EA3131_SDRAM_REFRESH (100) #define EA3131_SDRAM_OPERREFRESH (7812) /* Macro used to convert the above values (in nanoseconds) into units of * the HCLK. */ #define NS2HCLKS(ns,hclk2,mask) \ ((uint32_t)(((uint64_t)ns *(uint64_t)hclk2) / 1000000000ull) & mask) /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: lpc31_sdraminitialize * * Description: * Configure SDRAM on the EA3131 board * * Micron Initialization Sequence from their data sheet for the Micron * MT48LC32M16A2 32M x 16 SDRAM chip: * * "SDRAMs must be powered up and initialized in a predefined manner. * Operational procedures other than those specified may result in * undefined operation. Once power is applied to VDD and VDDQ * (simultaneously) and the clock is stable (stable clock is defined as * a signal cycling within timing constraints specified for the clock * pin), the SDRAM requires a 100µs delay prior to issuing any command * other than a COMMAND INHIBIT or NOP. * * "Starting at some point during this 100µs period and continuing at least * through the end of this period, COMMAND INHIBIT or NOP commands should * be applied. Once the 100µs delay has been satisfied with at least one * COMMAND INHIBIT or NOP command having been applied, a PRECHARGE command * should be applied. All banks must then be precharged, thereby placing * the device in the all banks idle state. * * "Once in the idle state, two AUTO REFRESH cycles must be performed. After * the AUTO REFRESH cycles are complete, the SDRAM is ready for mode * register programming. * * "Because the mode register will power up in an unknown state, it should * be loaded prior to applying any operational command." * * The JEDEC recommendation for initializing SDRAM is: * * APPLY POWER (Vdd/Vddq equally, and CLK is stable) * Wait 200uS * PRECHARGE all * 8 AUTO REFRESH COMMANDS * LOAD MODE REGISTER * SDRAM is ready for operation * * The Micron SDRAM parts will work fine with the JEDEC sequence, but also * allow for a quicker init sequence of: * * APPLY POWER (Vdd/Vddq equally, and CLK is stable) * Wait at least 100uS (during which time start applying and * continue applying NOP or COMMAND INHIBIT) * PRECHARGE all * 2 AUTO REFRESH COMMANDS (min requirement, more than 2 is also ok) * LOAD MODE REGISTER * SDRAM is ready for operation * ****************************************************************************/ static void lpc31_sdraminitialize(void) { uint32_t regval; /* These run-time calculations can be reduced dramatically if hclk is * replaced with an apriori value. */ #ifdef CONFIG_LPC31_SDRAMHCLK # define HCLK CONFIG_LPC31_SDRAMHCLK #else uint32_t hclk = lpc31_clkfreq(CLKID_MPMCCFGCLK2, DOMAINID_SYS); # define HCLK hclk #endif /* Check RTL for divide by 2 possible. If so change then enable the followng logic */ #if 0 uint32_t hclk2 = hclk; if (((getreg32(LPC31_MPMC_CONFIG) & MPMC_CONFIG_CLK)) != 0) { hclk2 >>= 1; } # define HCLK2 hclk2 #else # define HCLK2 hclk #endif up_udelay(100); /* Set command delay startergy */ putreg32(MPMC_DYNREADCONFIG_CMDDEL, LPC31_MPMC_DYNREADCONFIG); /* Configure device config register nSDCE0 for proper width SDRAM */ putreg32((MPMC_DYNCONFIG0_MDSDRAM|MPMC_DYNCONFIG_HP16_32MX16), LPC31_MPMC_DYNCONFIG0); putreg32((MPMC_DYNRASCAS0_RAS2CLK|MPMC_DYNRASCAS0_CAS2CLK), LPC31_MPMC_DYNRASCAS0); /* Min 20ns program 1 so that at least 2 HCLKs are used */ putreg32(NS2HCLKS(EA3131_SDRAM_TRP, HCLK2, MPMC_DYNTRP_MASK), LPC31_MPMC_DYNTRP); putreg32(NS2HCLKS(EA3131_SDRAM_TRAS, HCLK2, MPMC_DYNTRAS_MASK), LPC31_MPMC_DYNTRAS); putreg32(NS2HCLKS(EA3131_SDRAM_TREX, HCLK2, MPMC_DYNTSREX_MASK), LPC31_MPMC_DYNTSREX); putreg32(EA3131_SDRAM_TARP, LPC31_MPMC_DYNTAPR); putreg32(NS2HCLKS(EA3131_SDRAM_TDAL, HCLK2, MPMC_DYNTDAL_MASK), LPC31_MPMC_DYNTDAL); putreg32(NS2HCLKS(EA3131_SDRAM_TWR, HCLK2, MPMC_DYNTWR_MASK), LPC31_MPMC_DYNTWR); putreg32(NS2HCLKS(EA3131_SDRAM_TRC, HCLK2, MPMC_DYNTRC_MASK), LPC31_MPMC_DYNTRC); putreg32(NS2HCLKS(EA3131_SDRAM_TRFC, HCLK2, MPMC_DYNTRFC_MASK), LPC31_MPMC_DYNTRFC); putreg32(NS2HCLKS(EA3131_SDRAM_TXSR, HCLK2, MPMC_DYNTXSR_MASK), LPC31_MPMC_DYNTXSR); putreg32(NS2HCLKS(EA3131_SDRAM_TRRD, HCLK2, MPMC_DYNTRRD_MASK), LPC31_MPMC_DYNTRRD); putreg32(NS2HCLKS(EA3131_SDRAM_TMRD, HCLK2, MPMC_DYNTMRD_MASK), LPC31_MPMC_DYNTMRD); up_udelay(100); /* Issue continuous NOP commands */ putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_INOP), LPC31_MPMC_DYNCONTROL); /* Wait ~200us */ up_udelay(200); /* Issue a "pre-charge all" command */ putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_IPALL), LPC31_MPMC_DYNCONTROL); /* Minimum refresh pulse interval (tRFC) for MT48LC32M16A2=80nsec, * 100nsec provides more than adequate interval. */ putreg32(NS2HCLKS(EA3131_SDRAM_REFRESH, HCLK, MPMC_DYNREFRESH_TIMER_MASK), LPC31_MPMC_DYNREFRESH); /* Wait ~250us */ up_udelay(250); /* Recommended refresh interval for normal operation of the Micron * MT48LC16LFFG = 7.8125usec (128KHz rate). ((HCLK / 128000) - 1) = * refresh counter interval rate, (subtract one for safety margin). */ putreg32(NS2HCLKS(EA3131_SDRAM_OPERREFRESH, HCLK, MPMC_DYNREFRESH_TIMER_MASK), LPC31_MPMC_DYNREFRESH); /* Select mode register update mode */ putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_IMODE), LPC31_MPMC_DYNCONTROL); /* Program the SDRAM internal mode registers on bank nSDCE0 and reconfigure * the SDRAM chips. Bus speeds up to 90MHz requires use of a CAS latency = 2. * To get correct value on address bus CAS cycle, requires a shift by 13 for * 16bit mode */ (void)getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 13)); putreg32((MPMC_DYNCONFIG0_MDSDRAM|MPMC_DYNCONFIG_HP16_32MX16), LPC31_MPMC_DYNCONFIG0); putreg32((MPMC_DYNRASCAS0_RAS2CLK|MPMC_DYNRASCAS0_CAS2CLK), LPC31_MPMC_DYNRASCAS0); /* Select normal operating mode */ putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_INORMAL), LPC31_MPMC_DYNCONTROL); /* Enable buffers */ regval = getreg32(LPC31_MPMC_DYNCONFIG0); regval |= MPMC_DYNCONFIG0_B; putreg32(regval, LPC31_MPMC_DYNCONFIG0); putreg32((MPMC_DYNCONTROL_INORMAL|MPMC_DYNCONTROL_CS), LPC31_MPMC_DYNCONTROL); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: lpc31_meminitialize * * Description: * Initialize external memory resources (sram, sdram, nand, nor, etc.) * ****************************************************************************/ void lpc31_meminitialize(void) { /* Configure the LCD pins in external bus interface (EBI/MPMC) memory mode. * * LCD_CSB -> MPMC_NSTCS_0 * LCD_DB_1 -> MPMC_NSTCS_1 * LCD_DB_0 -> MPMC_CLKOUT * LCD_E_RD -> MPMC_CKE * LCD_RS -> MPMC_NDYCS * LCD_RW_WR -> MPMC_DQM_1 * LCD_DB_2 -> EBI_A_2 * LCD_DB_3 -> EBI_A_3 l * LCD_DB_4 -> EBI_A_4 l * LCD_DB_5 -> EBI_A_5 l * LCD_DB_6 -> EBI_A_6 * LCD_DB_7 -> EBI_A_7 * LCD_DB_8 -> EBI_A_8 * LCD_DB_9 -> EBI_A_9 * LCD_DB_10 -> EBI_A_10 * LCD_DB_11 -> EBI_A_11 * LCD_DB_12 -> EBI_A_12 * LCD_DB_13 -> EBI_A_13 * LCD_DB_14 -> EBI_A_14 * LCD_DB_15 -> EBI_A_15 */ putreg32(SYSCREG_MUX_LCDEBISEL_EBIMPMC, LPC31_SYSCREG_MUX_LCDEBISEL); /* Enable EBI clock */ lpc31_enableclock(CLKID_EBICLK); /* Enable MPMC controller clocks */ lpc31_enableclock(CLKID_MPMCCFGCLK); lpc31_enableclock(CLKID_MPMCCFGCLK2); lpc31_enableclock(CLKID_MPMCCFGCLK3); /* Enable the external memory controller */ putreg32(MPMC_CONTROL_E, LPC31_MPMC_CONTROL); /* Force HCLK to MPMC_CLK to 1:1 ratio, little-endian mode */ putreg32(0, LPC31_MPMC_CONFIG); /* Set MPMC delay based on trace lengths between SDRAM and the chip * and on the delay strategy used for SDRAM. */ putreg32(EA3131_MPMC_DELAY, LPC31_SYSCREG_MPMC_DELAYMODES); /* Configure Micron MT48LC32M16A2 SDRAM on the EA3131 board */ lpc31_sdraminitialize(); } #endif /* CONFIG_LPC31_EXTDRAM */